#![allow(dead_code, unused_variables, unused_macros)]

fn get_primes(n: usize) -> Vec<i64> {
    let mut primes = vec![true; n / 2];

    for p in (3..=n).step_by(2) {
        if !primes[(p - 3) / 2] {
            continue;
        }
        for m in (p * 3..=n).step_by(p * 2) {
            primes[(m - 3) / 2] = false;
        }
    }

    [2].into_iter()
        .chain(
            primes
                .into_iter()
                .enumerate()
                .filter_map(|(i, b)| b.then_some(i as i64 * 2 + 3)),
        )
        .collect()
}

fn main() {
    input!(n:i64);

    if n == 1 {
        println!("1");
        return;
    }

    let primes = get_primes((n as f64).sqrt() as usize);
    let mut ans = 1;
    for p in primes {
        let mut sum = 1;
        for i in 1.. {
            let pp = p.pow(i);
            if (n % pp) != 0 {
                break;
            }
            sum += pp;
        }
        ans *= sum;
    }
    if ans == 1 {
        ans += n;
    }
    println!("{}", ans);
}

mod xxx {
    // https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
    #[macro_export]
    macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        input_inner!{$s, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}
    #[macro_export]
    macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};
    ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

    #[macro_export]
    macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };

    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };

    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };

    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };

    ($next:expr, bits)=>{
        u64::from_str_radix(&$next(), 2).expect("Parse error")
    };

    ($next:expr, hexs)=>{
        u64::from_str_radix(&$next(), 16).expect("Parse error")
    };


    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}
}